Screw-machine



NiTED STATES PATENT OFFICE.

EDWIN C. HENN, OF BLOOMFIELD,CONNECTICUT.

SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent No. 624,802, dated May 9, 1.899. Application filed June 29, 1898. Serial No. 684,719. (No model.)

To vcl/ZZ whom it may concern,.-

Be it known that I, EDWIN C. HENN, a citizen of the United States, residing in Bloomfield, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Screw-Machines, of which the following is a specication.

This invention appertains' to screw-machines and other analogous metal-working machines,and it relates more particularly to attachments therefor.

In the manufacture of screws by machines of ordinary construction it has been customary to first diametrically reduce or shape the stock, then form the thread, and subsequently cutoff the finished screw, each step in the operation of forming the screw being separate and independent; and it is one of the principal objects of my present invention to furnish, in connection with a machine of the class specified having a work-carrying spindle and a tool-carrying spindle located in axial alinement and movable one toward the other, an attachment embodying atool-carrying slide movable in a plane intersecting the axis of the work-spindle, and to also provide means controlled by the carriage which carries the tool-carrying spindle on the advancing movement thereof for advanoingthe toolcarrying slide, whereby the stock may be turned down or shaped simultaneously With the operation of drilling or threading the same and whereby the operation of forming a screw will be materially facilitated.

A further object of the invention is to provide, in connection with the live-spihdle-carrying head and the tool-carriage of a metalworking machine, aslide supported for movement in a plane transverse to the axis of the work-carrying spindle, a slide-rest supported for adjustment in a plane parallel to the axis of said spindle, an oscillatory lever in connection with said slide, and a cam adjustably supported on the tool-carriage and having its working face in connection with the slide-actuating lever and adapted, upon the advancing movement of said carriage, for imparting an advancing movement to the tool-carrying slide.

In the drawings accompanying and forming part of this specification, Figure l is a plan view, partly in full and partly in dotted lines,

of a portion of a screw-machine provided with myimprovements. Fig. 2 isv a side elevation, partly in full and partly in dotted lines, of that portion of the screw-machine shown in Fig. l and showing the tool-carrying slide of the attachment in its normal retracted position. Fig. 3 is a cross-sectional view taken on a line corresponding with the dotted line a a, Fig. 2, andshowing the same parts as viewedl from the right hand, partlyin full and partly in dotted lines. Fig. eis a side elevation of a portion of the screw-machine, showing my attachment with the tool-carrying slide thereof in its advanced or working position; and Fig. 5 is an end view of a portion of the upper end of the tool-carriage and the tool-slide-actuating cam adjustably secured thereto.

The instrumentalities comprising the attachment that constitutes in part the subjectmatter ot` my present invention are shown combined with certain elements of a screwmaking machine such asI described in Letters Patent of the United States No. 530,17 9, dated December et, 1894, to which reference may be had; but it will be understood that such instrumentalities are applicable to other analogous machines-such, for instance, as lathes-and therefore it will be understood that my present invention is not limited to the combination with any particular machine of the instrumentalities comprising this invention.

, To this end'the invention consists in part in the combination, with a work-spindle carrier and its rotative spindle and with a movable tool-carrier having a tool located in. axial alinement with the work-spindle, of a tool-carrying slide supported on one carrier for movement in a plane intersecting the axis of the work-spindle and means in connection with and controlled by the movements of the movable carrier for advancing and retracting the tool-carrying slide, all of which will be hereinafter more fully set forth. A

In the drawings only so much of a machine is illustrated as is deemed necessary to a full understanding of the application and mode of operation of my present improvements,- certain parts of the machine being shown in full and other parts in dotted lines.

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The work-spindlecarrier and the tool-spin-4 dle carrier, Which are designated by C and C', respectively, may for the purposes of this invention be considered of substantially the saine construction and organization as those described in the Letters Patent hereinbefore referred to, and both carriers will be supported upon the bed of the machine, which is shown in dotted lines and designated by B, in substantially the same manner as described in said patent. The two carriers are shown partially in dotted and partially in full lines, and one of said carriers is supported for movement longitudinally of the bed of the machine.

By the term stationary c`arrier,7 which is for convenience used in the description and claims in this application, is meant a carrier havingr no movement longitudinally of the machine. This carrier, which constitutes the work-spindle carrier, will When embodied -in a screw-machine be constructed to support a series of work-carrying spindles and will be supported for rotative movement about a fixed axis, so that a series of pieces of stock may be simultaneously operated upon by a corresponding number of tools, as is well known in the art of screw-making.

The construction and organization of the work-spindle S and the tool-holder or spindle S in connection with the stationary and movable carriers C and C', respectively, may be substantially the same as those of the workspindle and tool-spindle described in the patent hereinbefore referred to. I n the preferred form thereof (shown most clearly in Fig. 1) the stationary head or carrier C and the movable tool-carrier C' have slideways 2 and 3 formed in the upper faces thereof7 respectively. f

Adjustably seated in the slideWay 2 of the carrier C is a tool-rest-supporting bracket or frame, which is designated in a general way by T, and adj ustably secured in the slideway 3 of the movable carrier is a cam or cam-carrying block, which is designated in a general way by T.

As a means for adjustably securing the bracket T to the carrier C the slideway will preferably be dovetailed, and the bracket will have a dovetail flange to lit said slideway, screws being extended through threaded holes in the bracket and bearing at their inner ends against the inner walls of the slideway to thereby clamp the parts firmly together. This means for adjustably attaching the bracket to the carrier C may be variously modified without departure .from this invention.

Asa convenient means for adjustably securing the cam-block to the movable carrier C' said cam-block is shown having a longitudinal slot 4, through which a clamp screw or bolt 5 is inserted, said bolt being screwed into the upper face of said carrier, as will beunderstood by reference to Figs. 1 and 5 of the drawings. j

The tool-rest-supportin g bracket T has one end thereof extended beyond the inner face Adjustably mounted on the slideway 6 of the tool-rest-supporting bracket is a sliderest 7, having a vertically-disposed slideway 8, adapted to receive a slide, said tool-rest preferably being secured in its adj-usted position upon the bracket by means of set-screws 9l and 9'. (See Fig. 2.)

Supported on the slideway 8 of the sliderest for movement in a plane intersecting the longitudinal axis of the work-carryin g spindle S is a vertically-disposed slide S2, having a suitable tool-clamp 10 at the lower end thereof, by means of which a tool, as the shapingtool T2, is clamped on the slide, an adjusting device being preferably provided in connection with the inner end of the slide to prevent accidental longitudinal movement of said tool during the cutting operation, said device being shown as a set-screw 12, mounted on the slide in position to engage the upper end of the tool. It is desired to state in this connection that any suitable means for clamping a tool upon and for adjusting said tool longitudinally of the slide may be provided in lieu of the device illustrated in the drawings without departure from this invention.

For the purpose of imparting an advancing movement to the'slide in a plane intersecting the longitudinal axis of the work- IOO spindle and simultaneously with the advancing movement of the tool-spindle carrier C a slide-actuator is provided, which in the preferred form (shown most clearly in Figs. 2 and 4 of the drawings) comprises the cam T', adj ustably secured to the movable carrier C and having two opposing vertically-inclined cam orworking faces 14 and 14', respectively, a slide-actuating lever 15, pivotallysupported at a point intermediate the ends thereof on an arm 16, preferably secured to the sliderest 7,and said lever 15 having one end thereof in movable engagement with the tool-carrying slide and having the opposite end seated between the working faces 14 and 14' of' the cam T', this end of the actuating-lever 15 being preferably furnished with the roll 17, which rides between the said working faces. As a convenient means of connection between the inner end of the cam-lever15 and the slide S2 said slide is furnishedat one edge thereof with two opposing lugs 18 and 18', between which the inner end of said lever 15 is movably seated. hlt is desired to state. in this connection that the particularconstruc- 'tion and organization of means for actuating IIO IZO

` Which carrier Will in practice have an advancing and retracting movement of predetermined length imparted to it by any wellknown or suitable mechanism-as, for instance, by means such as described in the patent hereinbefore referred to. The cam-block or lever-actuator may be adjusted on the carrier C in the direction of the Work-spindle to 4impart a Working stroke of predetermined length to the cutter-carrier during an advancing movement of predetermined length of the carrier C'.

I The Work-spindle S and tool-spindle S are shown in axial alinement with each other, and the Work-spindle is pro vided with means whereby the same may be rotated, such means being shown in dotted lines as a gear-Wheel g, Whichis iixed to the outer end of the Workspindle and is driven -by a gear g', iixed to the end of a main shaft 20, Which is shown in dottedlines extending through both the stationary and movable carriers.

The tool-spindle S', carried by the movable carrierC, is shown in Figs. 2 and 4L furnished y with a drill 21.

Bythe construction and organization of instrumentalities herein described it is possible to turn down or shape the periphery of -a piece of stock and simultaneously tap or screw-thread said stock. To accomplish this, assuming the Work-carrying spindle to be rotating and the parts of the machine to be in the position illustrated in Fig. 2, an advancing movement of the movable carrier C', together with the tool 2l, carried thereby, will simultaneously advance the toolcarrying slide, through the medium of the slide-actuating lever and lever-actuating cam, so that the forming-tool T2 and tlie drill 21 will simultaneously operate upon a piece of stock, as will be readily understood by a comparison of Figs. 2 and 4 of tlie draw-ings. On the return movement of the movable carrier C' the tool-carrying slide will be simultaneously retracted.

f Having described my invention, I claiml. The combination, With a fixed and a movable carrier, of a bracket on one of said carriers; a tool-carryingslide supported on the bracket, intermediate the two carriers; a cam on the other carrier; and a lever connecting said cam and tool-carrying slide and effective on the advance of the movable carrier for simultaneously imparting movement to the tool-carrying slide.

2. The combination, with` a stationary and a vmovable carrier and with a Work-spindle and a tool-holder carried, respectively, by said carriers, of a bracket fixed to the stationary y carrier and having a slideway located in parallelism With the axis of the Work-spindle; a tool-rest adj ustably supported on said slide- Way; a tool-carrying slide supported on the tool-rest, for movement in a plane crosswise of the longitudinal axis of the work-spindle; a cam mounted on the movable carrier; and a lever connecting the cam and tool-carrying slide, and effective on the advancing and retracting movements of the movable carrier for simultaneously imparting advancing and retracting movements to the tool-carrying slide.

3. In a machine. of the class specified, the combination, with a fixed and a movable carrier, the former of which is furnished With a Work-spindle and the latter With a tool-holder in axial alinement with the Work-spindle, of a slide-rest mounted upon the fixed carrier for 4adjustment in a plane parallel to the axis of the Work-spindle; aslide mounted on said rest, intermediate the two carriers, for movement in a .plane transverse to the axial line of the Work-spindle; a tool carried by said slide; a cam adjustably secured. to the movable carrier and having an inclined Working face on one side, thereof; and a lever pivot.

ally supported intermediate its ends on the slide-rest and having one end thereof in shiftable engagement With the tool-carrying slide and the opposite end in engagement with. the Working face of the cam.

4. The combination, With a ixed carrier and a movable carrier, each having a slide- Wayin the outer face thereof and with a Workspindle and 'a tool-holder carried one'by each carrier, of a bracket ad j ustably secured in the slideWay of one carrier; a cam-block adjustably secured in the slideway of the other earrier and having oppositely-disposed inclined. cam-faces on one side thereof; a tool-rest supported on the bracket jfor adjustment in a plane parallel to the axis of the Work-spindle; a tool-carrying slide supported on the sliderest for movement in a plane intersecting the axial line of the Work-spindle and having oppositely-disposed abutments at one side thereof and a slide-actuating lever pivoted intermediate its ends on a bracket iixed to the slide-rest and having one end thereof shiftably supported between the abutments on the slide, and having at the opposite ends thereof a roll seated between the cam-faces of the cam-block.

EDWIN c. HENN.l

Witnesses: v

FRANCIS H. RICHARDS, GEORGE, H. HOFFMAN.

ICC;

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